Alleviating Cd translocation and accumulation in soil–rice systems: Combination of foliar spraying of nano‐Si or nano‐Se and soil application of nano‐humus

Deng, Siwei; Li, Peirou; Li, Yunzhen; Ran, Zongxin; Peng, Yunxiao; Yang, Shili; He, Huan; Zhou, Ke; Yu, Jiang

doi:10.1111/sum.12707

Cited by 13 publications

(5 citation statements)

References 41 publications

(126 reference statements)

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“…A variety of intervention measures have been proposed to enhance soil's ecosystem service in protecting human health. For example, foliar spray with nano‐silicon and nano‐selenium can effectively reduce Cd uptake by rice (Deng et al, 2021). Ecological restoration was used to reduce the mobility and health risk associated with cadmium and lead (Zhao et al, 2022).…”

Section: Ecosystem Service: Human Healthmentioning

confidence: 99%

Soil health and ecosystem services

Hou

2023

Soil Use and Management

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Section: Ecosystem Service: Human Healthmentioning

confidence: 99%

Soil health and ecosystem services

Hou

2023

Soil Use and Management

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“…Silicon can significantly reduce Cd uptake by maintaining cell wall integrity [6], as it increases the amount of Cd that binds to the cell wall. Furthermore, Si application can promote Fe plaque formation on root surfaces, which hinders the entry of Cd into plants [7]. The precipitation of Si and Cd in the apoplast of roots and leaves is another important reason for the alleviation of Cd toxicity in plants [25].…”

Section: Effects Of Si On Plant Growth and N Contentmentioning

confidence: 99%

“…Different mechanisms occurring in soils and plants can explain the reduction of Cd toxicity in plants upon Si application. Generally, Si plays an important role in strengthening cell walls to provide a physical barrier to Cd entry [6], in restricting Cd translocation from roots to edible parts [7], and in alleviating oxidative damage induced by Cd stress [8], thereby improving plant growth [9][10][11][12]. In addition, Si application primarily increases soil pH, leading to Cd immobilization and co-precipitation [13,14], minimizes exchangeable speciation of Cd through Cd chelation, and forms an amorphous silica barrier through Si-Cd complexation, which ultimately reduces the bioavailability of Cd in soils [15].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, Si addition could have indirect influences on N behaviors in soils or plants by affecting Cd bioavailability. A lot of studies have reported that the uptake and translocation of Cd in plants is effectively reduced by the supply of Si, consequently mitigating the negative effects of Cd on N metabolisms in plants [6,7]. In soils, Si application improves the retention of NH 4 + -N, which is attributed to the decrease in Cd 2+ , which competes with NH 4 + for the adsorption sites in soils [20].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Silicon Application on Nitrogen Migration in Soil–Rice Systems under Cadmium Stress

Tan,

Gao,

et al. 2023

Sustainability

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Cadmium (Cd) contamination is a serious threat to plants and humans, which subsequently impairs sustainable agricultural production and ecosystem service. Silicon (Si) has been applied to mitigate Cd toxicity, but inevitably has direct and indirect impacts on nitrogen (N) behaviors in soil and plants. However, what role plants play in the N response to Si in soil–rice systems under Cd stress is not known. Therefore, the effects of Si on N migration through different pathways in the soil-rice system were systematically investigated in a rice-cultivation lysimeter experiment. The rice was planted in Cd-contaminated (5 mg kg−1) and uncontaminated soils with three levels of Si application (0, 100, and 200 kg SiO2 hm−2), and the contents of N and Cd in different forms in plants and soils were measured. The group without Cd and Si was set as CK. The study reported that Cd stress caused Cd accumulation in plants, inducing a decrease of 26.0~83.4% in plant dry weights and a decrease of 15.7~46.6% in N concentration compared with CK. Moreover, the leaching of N in soils was increased by Cd, in which the NO3−-N rather than the NH4+-N was leached out. These adverse effects on the plant growth and soil N loss were significantly alleviated by Si application in two ways: (1) the Cd availability in soils was reduced with the acid-extractable Cd (the Cd form with high mobility), decreasing from 1.07 to ~0 mg kg−1; (2) the Cd uptake and translocation in plants were restricted, with the Cd content decreasing by 59.1~96.4% and the translocation index decreasing from 17.7% to 2.2%. The combination of the two mechanisms consequently increased the N absorption of plants from 1.35 to 2.75~3.5 g. The results of the N mass balance calculation showed that, compared with soil N flux, plant-absorbed N contributed predominantly (43.9~55.6%) to the soil total N variation. Moreover, there is a significant trade-off between plant-absorbed N and soil N flux. The magnitude and direction of the soil N flux were greatly and negatively affected by plant-absorbed N during the flooding period. Hence, we conclude that Si application could reduce the leaching of N in soil–rice systems under Cd stress, mainly due to the promotion of the N absorption of plants rather than N immobilization in soils. This study provided new evidence that plants played a dominant role in N response to Si in soil-rice systems under Cd stress.

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“…More potential factors affecting the bioavailability of NPs will be discussed in Section 5. Engineered nanomaterials, such as metal, metal oxides or carbon-based nanomaterials, have been well documented to be absorbed by roots and transported upward through the xylem to shoot, leaf, flower, fruit or seed (Chen et al, 2022;Deng et al, 2021;Kah et al, 2018). Similarly, the uptake and transport patterns of NPs in root tissue could be extrapolated from previous studies on nanomaterials.…”

Section: Np Behaviour In Rhizosphere and Bioavailabilitymentioning

confidence: 99%

Nanoplastic–plant interaction and implications for soil health

Zhou

Wang

Gao

et al. 2022

Soil Use and Management

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Nanoplastics (NPs) are accumulating in the soil environment at a rapid rate, which may cause serious consequences for ecosystems and human health. However, environmental behaviour and toxicity of NPs in the soil-plant system remain poorly understood. This review summarizes current studies on NP-plant interactions to unravel uptake mechanisms and phytotoxicity of NPs. NPs could be taken up by plant roots and transported upwards through the xylem to all organs of the plant, even to the edible parts such as the grain, thereby threatening human health.The interaction of NPs with plants affects plant transport of water and nutrients.Besides, it induces significant oxidative stress leading to inhibition of physiological and biochemical activities such as photosynthesis, and thus adversely affects plant growth and development. In addition, the co-transport of NPs with other soil pollutants may induce the combined toxic effects. This study also discussed the potential mechanism of NP-plant interactions based on previous experience with engineered nanomaterials. Finally, a comprehensive assessment of the key challenges in each area was presented, and future perspectives are offered.

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Alleviating Cd translocation and accumulation in soil–rice systems: Combination of foliar spraying of nano‐Si or nano‐Se and soil application of nano‐humus

Cited by 13 publications

References 41 publications

Soil health and ecosystem services

Soil health and ecosystem services

Effects of Silicon Application on Nitrogen Migration in Soil–Rice Systems under Cadmium Stress

Nanoplastic–plant interaction and implications for soil health

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